Diamond



FIG. 1 is a perspective view of the diamond;

FIG. 2 is a side view of the diamond shown in FIG. 1, the other side views being substantially identical;

FIG. 3 is a top view of the diamond shown in FIG. 1; and,

FIG. 4 is a bottom view of the diamond shown in FIG. 1. 

The ornamental design for a diamond, as shown and described. 